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GMC

GMC troubleshooting questions? Ask a mechanic for answers

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if the truck is running fine and the temp and oil pressure are reading fine and the fluids are filled up you shouldn&#39;t harm anything by driving it and clearing the codes and see which code resets first

yes i dobut the code P0989 is stating the computer is seeing a wrong signal from the transmission 5 volts reference wire it sends to the transmissionnot necessarily that the transmission is overheatingas if it was it would show it was too hot in the dash when driving the truckusually with the code P0989 it ends up being the big electrical plug at the transmission being loose or dirty and a bad connection or an issue with the transmission temp sensor /tcm on the valve bodyif its not showing the transmission is overheating in the dash and you have never had a transmission service done yet on this truck i would have a shop do a transmission service to the truck and clear out the codes and see if they reset

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.